The Model Index
Models/DeepSeek

DeepSeek-V4.1-Flash

DeepSeekReleased 10 Sep 2026Open
CompareRun it yourself →Announcement
165154–177Index score#31 · provisional, limited data
0/ 8Core tests taken0 of 6 areas · plus 4 anchor tests
−32Versus the frontier at releasebest then: GPT-6 Astra
$0.015/ $0.40Price per million tokensinput / output, list price
1.05MContext windowtokens it reads at once

Where it sitson the frontier

Claude Opus 4.6 reached this score 7 months earlier.

Test resultsby area · tick = best by any model

Reasoning & knowledgeno evidence yet
GPQA Diamond
no result
Humanity's Last Exam
no result
Mathsevidence
FrontierMath T1-3
no result
Codingno evidence yet
SWE-bench Verified
no result
Terminal-Bench
no result
Agentsevidence
APEX-Agents
no result
Novel problemsno evidence yet
ARC-AGI-2
no result
Long tasksno evidence yet
METR time horizon
no result

Independent results from the Epoch AI benchmarking hub, best reasoning setting. The core tests are shown here; anchor tests also inform the score and can be shown above.

What others sayrank on each leaderboard

The Model Indexindependent tests, our method#31of 219 · 165
LMArena · Mathsmaths questions in chat#12of 373 · 1502LMArena · Codingcoding questions in chat#22of 383 · 1529LMArena · Textoverall chat quality, judged by people#37of 388 · 1473Artificial Analysis Intelligence Indexoverall capability across ten evaluations#20of 207 · 39Epoch Capabilities Indexoverall capability from many benchmarks#28of 239 · 155LMArena · Creative writingcreative writing#53of 386 · 1438LMArena · WebDevbuilding web apps and front ends#19of 123 · 1620

Further left is better. Leaderboards measure different things: LMArena is people voting blind between two answers, the others are test scores. Click any row for the source.

Best attop three among current models

Not in the top three among current models on any category we track.

Where this model places in the top three of today's models, on category leaderboards and on our core tests.

Where to use itprices checked 1 Oct 2026

From the lab

DeepSeek Chatapp · subscription↗DeepSeek APIAPI↗

API providers 28 · per million tokens, in / out

OOpenInference$0.030 / $0.50 · fp4cheapestMMorph$0.053 / $0.43 · fp8↗SSail Research$0.080 / $0.40 · fp4↗RRelace$0.027 / $0.60↗WWafer$0.050 / $0.60↗DDekaLLM$0.12 / $0.40↗IIo Net$0.12 / $0.41 · fp8↗DDeepInfra$0.14 / $0.42 · fp8↗

Run it yourself

🤗Official weightsdeepseek-ai/DeepSeek-V4.1-Flash↗

Provider prices come from OpenRouter's live listing; going direct to a provider can differ. Subscriptions are the lab's own apps.

Facts and sources

Released10 Sep 2026
Release entryDeepSeek-V4.1-Flash
Scored asDeepSeek V4.1 Flash
Artificial Analysis index39 · max
Output speed209 tokens/s

DeepSeek releasesaround this one

DeepSeek-V4-ProOpen
index 167
DeepSeek-V4-Flash-Vision-ExpOpen
DeepSeek-V4.1-FlashOpen
index 165